Lexus LS460 2011 Owner's Manual page 604

3-6. Using the interior lights

To prevent the battery from being discharged
If the interior lights remain on when the door is not fully closed and the
front interior light switch (door position on/off) is on, the lights will go off
automatically after 20 minutes.

Customization that can be configured at any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
Settings (e.g. The time elapsed before lights turn off) can be changed.
(Customizable features P. 762)
572
LS460_EE
Personal lights